Add flour instead of arrowroot to your recipe. You will need to add two times as much flour as you would arrowroot to achieve the desired effect. Flour, like arrowroot, acts as a thickener in many recipes.
Substitute cornstarch for arrowroot in your recipe. You can match the amount of cornstarch with the amount of arrowroot in the recipe. You can also use potato or rice starch in the same way. Cornstarch is a versatile thickening agent like arrowroot.
Use tapioca instead of arrowroot for thickening at low temperatures. Slowly mix in tapioca to achieve the desired results. Tapioca is a better thickener at low temperatures than flour or cornstarch.